Percentage Calculator

Find a percentage of a number, what percent one number is of another, and percent change.

About this tool

Enter two numbers and get three answers at once: A percent of B, A as a percent of B, and the percentage change from A to B.

How to use Percentage Calculator

  1. Type a value into A and a value into B.
  2. Press Calculate.
  3. Read the result for the question that matches what you need.

Frequently asked questions

How do I calculate a percentage increase?

Use the third result. It shows the change from A to B as a percentage of A.

What if A is zero?

Percent-change and ratio results are undefined when A or B is zero, so those rows show a dash.